Allow to create non-configurable instances programmatically.

src/main/java/org/csanchez/jenkins/plugins/kubernetes/KubernetesCloud.java

@@ -30,6 +30,7 @@
 import javax.annotation.Nonnull;
 import javax.servlet.ServletException;
 
+import edu.umd.cs.findbugs.annotations.NonNull;
 import org.apache.commons.codec.binary.Base64;
 import org.apache.commons.lang.StringUtils;
 import org.csanchez.jenkins.plugins.kubernetes.pipeline.PodTemplateStepExecution;
@@ -149,6 +150,28 @@ public KubernetesCloud(String name) {
         super(name);
     }
 
+    /**
+     * Copy constructor.
+     * Allows to create copies of the original kubernetes cloud. Since it's a singleton
+     * by design, this method also allows specifying a new name.
+     * @param name Name of the cloud to be created
+     * @param source Source Kubernetes cloud implementation
+     * @since 0.13
+     */
+    public KubernetesCloud(@NonNull String name, @NonNull KubernetesCloud source) {
+        super(name);
+        this.defaultsProviderTemplate = source.defaultsProviderTemplate;
+        this.templates.addAll(source.templates);
+        this.serverUrl = source.serverUrl;
+        this.skipTlsVerify = source.skipTlsVerify;
+        this.namespace = source.namespace;
+        this.jenkinsUrl = source.jenkinsUrl;
+        this.credentialsId = source.credentialsId;
+        this.containerCap = source.containerCap;
+        this.retentionTimeout = source.retentionTimeout;
+        this.connectTimeout = source.connectTimeout;
+    }
+
     @Deprecated
     public KubernetesCloud(String name, List<? extends PodTemplate> templates, String serverUrl, String namespace,
             String jenkinsUrl, String containerCapStr, int connectTimeout, int readTimeout, int retentionTimeout) {

src/main/java/org/csanchez/jenkins/plugins/kubernetes/NonConfigurableKubernetesCloud.java

@@ -0,0 +1,48 @@
+package org.csanchez.jenkins.plugins.kubernetes;
+
+import edu.umd.cs.findbugs.annotations.NonNull;
+import hudson.Extension;
+import hudson.model.Descriptor;
+import hudson.model.DescriptorVisibilityFilter;
+import hudson.slaves.Cloud;
+import jenkins.model.Jenkins;
+import net.sf.json.JSONObject;
+import org.kohsuke.stapler.StaplerRequest;
+
+public class NonConfigurableKubernetesCloud extends KubernetesCloud {
+    public NonConfigurableKubernetesCloud(@NonNull String name, @NonNull KubernetesCloud source) {
+        super(name, source);
+    }
+
+    @Extension
+    public static class FilterImpl extends DescriptorVisibilityFilter {
+        @Override
+        public boolean filter(Object context, Descriptor descriptor) {
+            return !(descriptor instanceof DescriptorImpl);
+        }
+    }
+
+    @Extension
+    public static class DescriptorImpl extends KubernetesCloud.DescriptorImpl {
+        @Override
+        public String getDisplayName() {
+            return Messages.NonConfigurableKubernetesCloud_displayName();
+        }
+
+        @Override
+        public boolean configure(StaplerRequest request, JSONObject object) throws Descriptor.FormException {
+            return true;
+        }
+
+        @Override
+        public Cloud newInstance(StaplerRequest req, JSONObject formData) throws Descriptor.FormException {
+            if (req != null) {
+                // We prevent the cloud reconfiguration from the web UI
+                String cloudName = req.getParameter("cloudName");
+                return Jenkins.getInstance().getCloud(cloudName);
+            } else {
+                throw new IllegalStateException("Expecting req to be non-null");
+            }
+        }
+    }
+}

src/main/resources/org/csanchez/jenkins/plugins/kubernetes/Messages.properties

@@ -1 +1,2 @@
 offline=Kubernetes agent is going offline
+NonConfigurableKubernetesCloud.displayName=Kubernetes (predefined settings)

src/main/resources/org/csanchez/jenkins/plugins/kubernetes/NonConfigurableKubernetesCloud/config.jelly

@@ -0,0 +1,6 @@
+<?jelly escape-by-default='true'?>
+<j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:d="jelly:define" xmlns:l="/lib/layout" xmlns:t="/lib/hudson" xmlns:f="/lib/form" xmlns:c="/lib/credentials">
+  <f:invisibleEntry title="${%Cloud name}">
+    <f:readOnlyTextbox name="cloudName" value="${instance.displayName}"/>
+  </f:invisibleEntry>
+</j:jelly>